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Goodwill and Other Intangible Assets (Tables)
 3 Months Ended
Mar. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes in the carrying value of goodwill
Changes in the carrying value of goodwill for each reporting unit are as follows (in thousands):
 
 
Energy Chemical Technologies
 
Consumer and Industrial Chemical Technologies
 
 TeledriftTM
 
Total
Balance at December 31, 2013
 
$
30,296

 
$
20,642

 
$
15,333

 
$
66,271

Addition upon acquisition of EOGA
 
5,312

 
—

 
—

 
5,312

Balance at March 31, 2014
 
$
35,608

 
$
20,642

 
$
15,333

 
$
71,583